TY  - JOUR
N2  - An experimental study was carried out on a dedicated compressed natural gas direct injection (CNG-DI) engine with a compression ratio (CR) of 14 and a central injection system. Several injection timing parameters from early injection timing (300° BTDC) to partial direct injection (180° BTDC) to full direct injection (120° BTDC) were investigated. The 300° BTDC injection timing experiment was carried out to simulate the performance of a port injection engine and the result is used as a benchmark for engine performance. The full DI resulted in a 20 higher performance than the early injection timing for low engine speeds up to 2750 rpm. 180° BTDC injection timing shows the highest performance over an extensive range of engine speed because it has a similar volumetric efficiency to full DI. However, the earlier injection timing allowed for a better air-fuel mixing and gives superior performance for engine speeds above 4500 rpm. The engine performance could be explained by analysis of the heat release rate that shows that at low and intermediate engine speeds of 2000 and 3000, the full DI and partial DI resulted in the fastest heat release rate whereas at a high engine speed of 5000 rpm, the simulated port injection operation resulted in the fastest heat release rate. © Universiti Malaysia Pahang.
IS  - 1
ID  - scholars1215
KW  - Benchmarking; Compressed natural gas; Engines; Ignition; Speed
KW  -  Combustion analysis; Direct injection spark ignition engines; Early injections; Engine performance; Heat Release Rate (HRR); Injection systems; Injection timing; Volumetric efficiency
KW  -  Direct injection
Y1  - 2010///
A1  - Aziz, A.R.A.
A1  - Firmansyah
A1  - Shahzad, R.
JF  - International Journal of Automotive and Mechanical Engineering
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84875390776&doi=10.15282%2fijame.2.2010.5.0013&partnerID=40&md5=7ae74dbaab931e658c93100dbb61a3af
VL  - 2
AV  - none
N1  - cited By 26
TI  - Combustion analysis of a cng direct injection spark ignition engine
SP  - 157
PB  - Universiti Malaysia Pahang
SN  - 22298649
EP  - 170
ER  -